en:ibm:prcp:vio:getfont
no way to compare when less than two revisions

Differences

This shows you the differences between two versions of the page.


Last revision
—en:ibm:prcp:vio:getfont [2016/02/04 10:45] – created valerius
Line 1: Line 1:
 +==== VioGetFont ====
 +
 +**Bindings**: C, MASM 
 +
 +This call returns either the font table of the size specified or the font in use. 
 +
 +//VioGetFont// (RequestBlock, VioHandle) 
 +
 +//RequestBlock// (**PVIOFONTINFO**) - input/output 
 +Address of the font structure that returns current RAM font or specified ROM or code page font depending on the request type: 
 +
 +//length// (**USHORT**) 
 +Length of structure, including length. 
 +
 +14 Only valid value. 
 +
 +//reqtype// (**USHORT**) 
 +Request type: 
 +
 +^Value ^Definition ^
 +|0 |Get current RAM font for EGA, VGA, or IBM Personal System/2 Display Adapter. |
 +|1 |Get ROM font for CGA, EGA, VGA, or IBM Personal System/2 Display Adapter. |
 +
 +//pelcolumns// (**USHORT**) 
 +Pel columns in character cell. 
 +
 +//pelrows// (**USHORT**) 
 +Pel rows in character cell. 
 +
 +//fonttable// (**PVOID**) 
 +Address of the requested font table returned in a caller-supplied data area. If the storage area is accessed by way of an address of 0, a system-supplied segment containing the requested font table is returned. 
 +
 +//tablelength// (**USHORT**) 
 +Length, in bytes, of the caller-supplied data area where the font table is returned. 
 +
 +//VioHandle// (**HVIO**) - input 
 +Reserved word of 0s. 
 +
 +//rc// (**USHORT**) - return 
 +Return code descriptions are: 
 +
 +|0 |NO_ERROR |
 +|355 |ERROR_VIO_MODE |
 +|421 |ERROR_VIO_INVALID_PARMS |
 +|438 |ERROR_VIO_INVALID_LENGTH |
 +|465 |ERROR_VIO_DETACHED |
 +|467 |ERROR_VIO_FONT |
 +|494 |ERROR_VIO_EXTENDED_SG |
 +
 +**Remarks** 
 +
 +For //reqtype// = 1, return ROM font, the font size requested must be supported by the display adapter installed. The 8x8, 8x14, 9x14, 8x16, or 9x16 character font may be requested for the VGA or PS/2 Display Adapters. The 8x8, 8x14, or 9x14 font may be requested for the enhanced graphics adapter. The 8x8 font may be requested for the color graphics adapter. 
 +
 +**Note**: Although graphics mode support is provided in [[en:ibm:prcp:vio:|VioGetFont]], this support is not provided by the Base Video Handlers provided with OS/2. 
 +
 +
 +For //reqtype// = 1, return ROM font, the far address returned is a ROM pointer only for those fonts where the font table for the full 256-character set is actually contained in ROM. Otherwise, the far address returned is a RAM pointer. Note that for 8x8 on the CGA, the font table for the full 256-character set is returned. For 9x14 or 9x16 the font table for the full 256-character set is also returned. Partial fonts are not returned. The 9x14 and 9x16 fonts are derived from variations of the 8x14 and 8x16 fonts, respectively, where the definitions of fonts for those characters that are different, are replaced. 
 +
 +For [[en:ibm:prcp:vio:getfont|VioGetFont]] specifying reqtype = 1, return ROM font, the font returned is derived from the fonts contained in the system, EGA, VGA, and PS/2 Display Adapter BIOS data areas as applicable. There is an exception for the EGA, VGA and PS/2 Display Adapter when [[en:ibm:prcp:vio:setcp|VioSetCp]] or [[en:ibm:prcp:vio:setfont|VioSetFont]] has been issued. In that case, the font of the size requested is returned from the active code page or the list of user fonts already set.